Inclosed-diaphragm buzzer



Nov. 18, 1924- F. W. WOOD INCLOSED DIAPHRAGM BUZZER Filed Aug. 7, 1919 M .X Mm

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Patented Nov. 18, 1924.

UNITED STATES PATENT OFFICE.

FRANK W. VOOD, OF MONTCLAIR, NEI/V JERSEY, ASSIGNOR TO CHARLES CORY 8c SON, INCORFORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

INCLOSED-DIAPHRAGM BUZZER.

Application filed August 7, 1919.

To all whom t may concern:

Be it known that I, FRANK W. IVooD, a citizen of the United States, residing at Montclair, in the county of Essex and State of New Jersey, have invented new and useful Improvements in Inclosed-Diaplnagm Buzzers, of which the following is a specifcation.

My invention relates to electro-mechanical apparatus for producing` sound and particularly to buzzers of the inclosed diaphragm type.

Sound producing apparatus is often desired for signal purpose in locations where operating conditions make the use of an ordinary buzzer impractical. Such locations occur' particularly in factories, engine rooms, and on shipboard; and the conditions encountered include excessive moisture, foreign matter, vibration, and exposure to blows. In some places all of these conditions occur, especially on shipboard, where the buzzer is constantly subjected to the corrosive action of moisture-laden sea air and is sometimes needed in positions where it may be directly exposed to water.

In engine room locations, and sometimes in factories, the buzzer is subjected to excessive vibration which would rapidly derange a complex or sensitive construction. This is also true of buzzers for usein gun ports or turrets either on shipboard or ashore, where they are exposed to the vibration caused by the detonation of heavy guns. Buzzers located in engine rooms and factories also are often exposed to grease, dirt, dust and other foreign matter which tends to work into the mechanism and prevent its operation.

An object of my invention is to provide a buzzer which may be subjected to the hardest usage, especially under the conditions outlined above, without becoming deranged. It is further adapted for use in confined quarters, such as commonly occur on shipboard, where the use of a sound-producing device with a horn is often objectionable because of the space occupied by the horn.

Furthermore, my buzzer is designed and arranged to produce a very loud, sharp sound which can be easily heard above the noises of engine rooms, gun ports, factories, and similar locations. It is also compact, so that it may be placed in out-of-the-way lo- Serial No. 318,001.

cations and is protected so than none of the working parts are exposed to chance blows.

I have also arranged the working parts in units, and have connected them to each other and to the casing of the buzzer so that they may readily be removed as a complete nnit when the buzzer is inaccessible, and repaired in a convenient location without det-aching the entire buzzer from its position. v

I have also provided an improved construction which is adapted to be mounted on bulkhcads or similar places so as to use the structure on which it is mounted to form a sounding board for the amplification of the sound waves from the buzzer.

Further objects and advantages of my construction will be apparent from the following description taken in connection with the accompanying drawings, in which:

F igure l is a vertical cross-sectional view of the buzzer, one magnet being shown in section, the other in plan view,

Figure 2 is a top plan view with the casing cover removed,

Figure 3 is a fragmentary side plan view with the upper portion of the casing broken away showing part of the mechanism in transverse section at right angles to that of Figure l, and

.Figure 1I is a fragmentary bottom plan Vl\V.

My buzzer' may include a number of magnets l0, preferably two in number, which may be mounted adjacent and parallel to each other in any desired way, such as by attaching a reduced portion of cores 1l re` movably in a suitable aperture in yoke 12 as by screws 13. An armature 14e is removably mounted adjacent the poles of magnets 10 in any suitable manner, preferably by a flexible plate l5 attached to the arma ture 14 and mounted on the buzzer casing, to hold the armature in fixed position and prevent its being disarranged even under the heaviest vibration. Plate l5 may be mounted on the casing by providing lugs 15 and screws 15b for attaching the plate to the lugs. Plate 1:3 may be cut away in part or otherwise shaped to permit armature 14 sufficient freedom of motion.

Directly under and adjacent to the armature 14 is located a diaphragm 16, which preferably is tightly stretched across an Ilo aperture in the buzzer casini@Y and is held in position in any desired manner, such tor instance, as by a removable clamping ring 17 screwed to the casing. ll'lounted on the armature 14tis a hammer button 1S arranged to be normally in contact with diaphragm l0. Preferably, hammer button lt; is in the form olf a stud passing-` through the armature and held in position in any desired way, such as by slightly expanding the upper edge thereoli. il perforated covering may, it' desired, be mounted across the aperture in the casino; to protect the diaphragm 16 from chance blows. rlfhis may be in the 'form olf a spider either cast integral with or attached to the casing in any desired manner.

My buzzer is primarily intended 'tor use with direct current though the mechanism hereinbelore described will by itself. he operative it used with alternating current. For the 'former use, l provide a vibrating' interruptor in the magnet circuit and have constructed and arranged the vibrator ol? the interrupter so that it is also opera.- tive to return the armature to its normal position at'ter the circuit has been broken. rlfhe vibrator mechanism is preteralilj.' mounted as a unit. ln the torni showin l utilize a carrier plate Q() which preferably lies transverse to and is mounted upon yolie l2 as by screws 2l. it one end of the carrier plate, l mount vibrator linger 22 e1;- tending across the centre oit the junction between yoke l2 and carrier plate 2l) and preferably having a reverse bend Ql to in crease its resiliency.

I provide means lor regulating' the position of linger 22, said means preferably consist-ing ot a screw 2lbeariue; on linger 22. Any desired method of locking' screw 2l in position may be utilized such as a jam nut. but l have shown a short locking` plate 2li through which screw is threaded. lt will be apparent that by normally havingplate 26 and plate 25 slightly spaced where screw Qel passes through them, srew 2l: may be clamped in adjusted position by tightening' clamping' screw 27 passing through plate 26 and threaded into an tension on plate 25. By this i'neans. adjustingr screw 24.- is held so .firmly in position that even excessive vibration will not shitt it. Plate 25 and linger 22 are j'n'e't'erahly separated by bloclfs ol insulation Q9 and are held in position by insulated screws Q9. For convenience. l may provide a connection plate 30 adjacent linger 2&2 and held in position by screws 29, plate 30 having)l mounted thereon a suitable terminal 8l for one ol.I the circuit wires.

At the opposite end oll carrier plate Qt) is mounted a springY contact Vlinger 32 cxtendine toward the centre ol said carrier plate and having` a Contact point 33 mounted on its inner end and located so as to rest normally against a similar contact point 3st on the extremity ol spring linger lllounted above spring linger is a plate 25 carrying' adj Listing screw 2l having' its lower end in contact with linger 32. The same construction ol adjustinfr mechanism is provided lor the spring' .linger 3&2, as is provided for the linj'er the parts being' indicated by the relerence characters Q-lfa, 25, 2G and 27, the said mechanism licinev suitably insulated by a block 38 and held in position by insulatingh screws 259.

.lt will be noted that spring` linger 522 ei;- touds across the point ot junction ol' yoke l2 and carrier plato 2th and contart points lil and :lll are located. at one side oit the unction.

l provide means for utilizing' spring tinger 22 to press armature ll away 'from the magnets l() and toward the diaplnagm lli. This may consist ot a plunger rod 38 slidiup; in suitable apertures through carrier plate 2l) and volte l2 at approximately the centre ol their junction, the lower end of plunger rod bfi being operatively positioned to press armature lldownwardly. Various connect-ions 'lor the ends oi rod 3S may be provided. the construction being` such that the plunger rod may, il desired, be lined at its lower end to the armature structure; but for convenience in assembling` and removing part or all oll the mechanism for repairs, l prefer to provide a loose connection at the lower end of the plunger rod. Vlhis may be done in several 7ays. l preter to provide a socket fill in hammer button ll, the lower end olf plijineer rod 238 resting1 loosely in socket ffl so as to bear against the bottom ol the socket. but beine' easily removable therefrom. rllhe upper end ot plunger rod liti carries an insulatin element -lll preferably in the torni o t a button carried by a cup-shaped holder y-1ll lormed on the upper end ot plunger rod. 'ltll. llutton ll0 bears against the lower lace etV spring' contact linger which serves to press plunger rod 35i downwardly and thereby to 'torce the armature let away from magnets lo.

Vl provide a wateretig'ht casingA tor the buzzer. This casing` may be constructed in numerous ways, but preferably consists of a cylindrical wall l2 having ends 43 and 44. Diaphragm lll is mounted in one end such as @lele and the ends are attached to side wall si?, so as to Atorm a completely water-tight casingu which will effectively protect the buzzer niechanism above described from dirt. grease. oil, dust. moisture, and even water` illne end olt the casing` either the end. containingl the diaphragm or the opposite end, is preferably reinovalile to render the buzzer mechanism accessible. l have shown end l'l in the torni of a cap threaded on the end ot side wall 4Q, and preferably lll) having a ground joint therewith to make.

the connection water-tight. A {lat-sided knob is preferably formed in the central part of cap end to p-rovide wrench-en gaging means tor tightening or removing the cap. The casing is adapted to be mount ed with diaphragm 16 adjacent the base upon which the buzzer' is mounted, and I have provided mounting means whereby the buzzer may be located adjacent to but slightly spaced from the base which is preferably a bulkhead or other medium capable ot' some vibration; and I have provided a space around the bottom ot' the easing through which the sound from the diaphragm reflected by the base may escape. To produce this result, I preferably provide a plurality o'l downwardly extending lugs 46 adapted to be screwed or otherwise attached to the base, and leaving spaces et? between the casing and the base intermediate adjacent lugs. For convenience. in removal olE the operative portion of the buzzer, I preferably mount yoke 12 detachably upon the inside oit the casing. This may be done in different ways, but I preferably provide lugs '-18 on said side wall and detachably mount the ends ot yoke 12 thereon as by screws 49.

I have also shown the side wall l2 as provided with a shouldered aperture 50 into which may be threaded the end ot a conduit for leading in the circuit wires; but any other preferred form of lead-in may be provided.

In operation, the energizing olE magnets 10 will draw armature let upwardly and raise hammer button 1S out ot' contact with diaphragm 1G. rIhis motion will also move plunger rod 3SL1 upward, raising the end oi spring Contact finger 22 and separat-ing contacts and 34, thereby breaking the circuit and deenergizing magnets 10. Armature 11 will thereupon spring back into place, being aided therein by the pressure ot plun ger rod 3S which is forced downward by the resiliency ot' spring finger This return motion will bring hammer button 1S sharply down into contact with diaphragm 1G, but the moment the diaphragm is struck, contacts 35 and 34 will be again brought into contact with each other, and the magnet circuit reestablished, so that the hammer button will be retracted as the armature is im-V mediately raised again. rlhe Contact pointmay be adjusted by manipulation of adjusting screw Q4, and the pressure ot' spring contact finger on plunger rod 3S may be varied by manipulation ot adjusting screw 2l so that the operation olf the buzzer is susceptible ot' simple and thorough adjustment. Hooks i121 and 32 may be provided on members Q2 and SQ, respectively, tor easily inserting and securing conductorwires.

It will be noted that the buzzer is constructed on what may be called a unit system to Yfacilitate assembly and removal for repairY Yoke 12 carries practically the entire operative mechanism and carrier plate 2() detachably mounted thereon carries the complete interrupter mechanism. `Yoke .12 is readily detached and removed by taling out screws elf), and carrier plate 20 can be removed without disturbing the rest ot the mechanism by taking out screws Q1. It will be apparent that any derangement of the parts may be repaired, and any renewal that is necessary is -facilitated, particularly where the buzzer is in an inaccessible posi tion, without removing the buzzer casing .trom its base.

It will be apparent that the construction is unusuallyv simple, and all moving parts are positively and strongly held in position., but are so arranged as to be readily removable and replaceable. without taking down the entire structure. l`urthermore, the buzzer is extremely compact and at the same time is unusually loud, as the niutl'ling etl'ect of a unter-tight casing, which has been one of the chief dilliculties with the inclosed type ol' buzzer, has been entirely avoided by the provision ot the ample diaphragm, the use ot the mounting as a sound board, and the provision ot ample space tor the sound waves to emerge.

It is to be understood, however, that the construction described, while it is the prelerred torni of my invention, is subject to many variations and modilications aside from those indicated, and I do not consider my invention lo be limited to the construction shown except as my invention is dened by the scope ot the claims.

I claim .1.. In soundy producing apparatus, an armature, sound producing means actuated by the armature, a yoke, a magnet mounted on the yoke adjacent the armature so Jthat the energizing olf the magnet will shift the armature from its normal position, a carrier trame mounted transversely ou said yoke, the longitudinal centres ot' said carrier frame and yoke being approximately in register, a resilient element mounted at one end adjacent the end ot' the carrier frame and extending across said registering centres, a yieldable element mounted at one end adjacent the opposite end ot' the carrier trame and extending toward said centres into juxtaposition with the inner end of the resilient element, cooperating contact points carried by the adjacent ends ot the resilient and yieldable members connected in circuit willi the magnets, a plunger rod slidably mounted through the carrier trame and yoke adjacent said centres, one end otl the plunger engaging the armature and the other being engaged by the resilient element, the construction being such that the energizing of position by presente on the l'oeproontng' elen'lent, :md sinngdmnoously dosing the magnetic Circuit.

2. In Sound producing; eppznntne, .n one ing including a sound-prodosing daph 'ogm 10 at one end.. a lelnovftble Cloeure at the opposite end, and Suppotng portions projectng inwardly between the seid ends, a yoke deteehably seemed to the supporting pot-tions of the Casing on the end next to Leleeeo the closure for the latter, a magnet attached to the yoke7 an armature lnovably mounted neelthe magnet and adapted to be attracted by the Sa1ne,means Connected to the armature ifol' vibrating the diaphragm when the nlugnet nltellnittently energized, :L supporting element detuehably eectned to the yoke on the end next the Casing elosule, and circuitlueztkog moans for the magnets attached to the said supporting element as an independently removable unit,

'In teetlnonv whereof l have hereunto Set my hand.

FRANK W. VVUOD. 

